Structural and Chemical Analysis of Crystal Enamel Nucleation

1999 ◽  
Vol 599 ◽  
Author(s):  
I. A. Belío-Reyes ◽  
L. F. JimÉNez-García ◽  
J. Reyes-Gasga
Keyword(s):  
Chemical Analysis ◽  
Chemical Properties ◽  
Dental Enamel ◽  
Nucleation And Growth ◽  
Chemical Information ◽  
Enamel Mineralization ◽  
Outermost Zone ◽  
And Chemical Properties

AbstractThe aim of the present study is to obtain structural and chemical information about nucleation and growth of dental enamel as a function of location in secretory mouse foetus enamel. Then enamel tissues were obtained from 19-days-mouse foetus. TEM images show that enamel crystallites had the well-documented thin ribbons, or needles. They were found in the outermost zone in the vicinity of ameloblasts. Chemical analysis by EDS showed that, besides the elements of hydroxyapatite, Na, Cl, Al and Mg are presents from the beginning of enamel mineralization. All of these elements will play an important role on the physics and chemical properties in mature enamel.

Modification of the mechanical and chemical properties of dental enamel using Er laser radiation with sub-ablative energy density

2013 ◽  
Vol 2 (3) ◽  
Author(s):  
Andrey V. Belikov ◽  
Alexei V. Skrypnik ◽  
Ksenia V. Shatilova
Keyword(s):  
Laser Radiation ◽  
Tooth Enamel ◽  
Aggressive Medium ◽  
Chemical Properties ◽  
Dental Enamel ◽  
Acid Resistance ◽  
Biological Tissues ◽  
Human Tooth ◽  
Tooth Crown ◽  
And Chemical Properties

AbstractLasers can be successfully used for the modification of biological tissues. In dentistry, an increase in strength and the chemical properties of enamel with a laser in order to prevent tooth decay appears to be quite promising. We investigated microhardness and acid resistance of human tooth enamelEnamel of the tooth crown was investigatedThe measured microhardness of intact enamel of human tooth crown wasIn this paper it was found that sub-ablative YLF:Er laser radiation modifies the intact enamel in such a way that the enamel microhardness increases and can exceed the intact enamel microhardness by 20%. Laser-treated enamel can resist abrasive impact during a time equivalent to 3 years of standard dental hygiene. Laser-treated enamel can resist an external aggressive medium containing 37.5% phosphoric acid significantly longer than intact enamel. The observed improvement in the mechanical and chemical properties of the enamel can be explained by a significant reduction in enamel porosity after laser radiation impact.

Quantitative Structural and Chemical Analysis of Thin Films: Part II

MRS Bulletin ◽  
1993 ◽  
Vol 18 (1) ◽  
pp. 21-23
Author(s):  
Y. Bruynseraede ◽  
Ivan Schuller
Keyword(s):  
Thin Films ◽  
Chemical Analysis ◽  
Quantitative Determination ◽  
Chemical Properties ◽  
Atomic Level ◽  
New Techniques ◽  
Comprehensive Review ◽  
Chemical Determination ◽  
And Chemical Properties

In the second of this two-part series for the MRS Bulletin, we present the most commonly used tools for the quantitative determination of structure and chemistry in thin films. The physics of thin films is at a stage during which one encounters phenomena that have a fragile dependence on the structure and chemical properties of the interface; the field, therefore, is at a stage during which quantitiative structural and chemical determination at the atomic level is a must. It is the purpose of the December and January issues of the Bulletin to provide a start for researchers interested in the field. Of course, even during the writing of these articles new techniques are being invented and it is therefore impossible to provide a comprehensive review of all techniques being used these days.

Modification of Etching Patterns in Bovine Dental Enamel

1979 ◽  
Vol 58 (8) ◽  
pp. 1840-1847 ◽  
Author(s):  
S. Lees ◽  
P.L. Trombly ◽  
Z. Skobe ◽  
E.E. Gariepy ◽  
A.F. Trull
Keyword(s):  
Organic Material ◽  
Chemical Properties ◽  
Dental Enamel ◽  
Organic Content ◽  
Tooth Surface ◽  
Physical And Chemical Properties ◽  
Etching Pattern ◽  
Naoh Solution ◽  
Physical And Chemical ◽  
And Chemical Properties

It is presumed that the etching pattern is controlled by the residual organic content of dental enamel. Pretreatment with 1.ON NaOH should remove the organic material and modify the etching pattern. SEM studies and other tests for physical and chemical properties show that the predicted modification of the etching pattern, when the tooth surface is pretreated with NaOH solution, occurs apparently without other changes of properties.

scholarly journals Morphogenetic features of properties of initial carbonate soils

2013 ◽  
pp. 324-332
Author(s):  
Roman Semashchuk
Keyword(s):  
Chemical Analysis ◽  
Key Words ◽  
Carbonate Rocks ◽  
Chemical Properties ◽  
Morphological Properties ◽  
Physical And Chemical Properties ◽  
Agricultural Plant ◽  
Physical Chemical ◽  
Physical And Chemical ◽  
And Chemical Properties

Results of studies of key morphological, physical-chemical and chemical properties of underdeveloped carbonate soils, which are influenced by woody, herbaceous and agricultural plant formations on eluvium-delluvium carbonate rocks, were given. Key words: initial soils, morphological properties, physical and chemical properties, gross chemical analysis.

scholarly journals Chemical information presentation in the Crystallography Open Database

2014 ◽  
Vol 70 (a1) ◽  
pp. C1710-C1710
Author(s):  
Andrius Merkys ◽  
Agnė Matusevičiūtė ◽  
Antanas Vaitkus ◽  
Armel Le Bail ◽  
Daniel Chateigner ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Chemical Structure ◽  
Chemical Properties ◽  
Structural Formula ◽  
Chemical Information ◽  
Scientific Journals ◽  
Personal Communications ◽  
Quality Checks ◽  
Crystallography Open Database ◽  
And Chemical Properties

Crystallography Open Database (COD, http://www.crystallography.net/) is the largest to date curated open-access collection of small to medium sized unit cell crystal structures [1,2]. Over 11 years of development, COD has accumulated over 1/4 million structures from the peer reviewed press and personal communications. COD has an automated data submission Web site, performs routine automatic quality checks on all incoming structures and is now recommended as a database for crystallographic deposition by several scientific journals. To facilitate automatic use and discoverability of COD data, and to increase usefulness of our database for chemists, two steps were undertaken. COD was now supplemented with software and data from the CrystalEye data aggregator. The new software permits extracting chemical data and presenting them as structural formula, unique moieties, and chemically significant fragments. We have also implemented search of crystal structures by the structural chemical formulae of the target compounds. The search is first of all performed among 70 000 hand-curated chemical structure descriptors, and can be extended to automatically generated descriptors. To facilitate data curation, a new software platform for data review is being developed. All COD structures will be evaluated using statistical distributions of observed geometrical and chemical properties (bond lengths, angles, dihedrals, planarities). The most statistically unusual structures will be forwarded to a COD reviewer Internet forum, where qualified reviewers will be asked whether they find provided evidence for a particular structure convincing or not. In this way, a set of human review indicators (convincing/unconvincing) will be available along with the match against the bulk of data (usual structure/unusual). Such indicators would be especially useful for deciding which COD records require special attention and which subsets of COD should be selected for reliable scientific inferences.

scholarly journals Preparation and standardization of kasis bhasma by two different methods and its analytical study

2021 ◽  
Vol 6 (4) ◽  
pp. 213-216
Author(s):  
Manjiri Ranade ◽  
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Analytical Study ◽  
Ferric Iron ◽  
Chemical Properties ◽  
Pure Form ◽  
Local Market ◽  
Medical College ◽  
Physical And Chemical ◽  
And Chemical Properties

Different ayurvedic texts have mentioned different methods of shodhan (Purification) and maran (incineration) of ayurvedic mineral preparations of kasis. Though different methods of shodhan and maran are described in various texts complete physio chemical standardization is necessary to prepare the pure form and for quality assurance as well as It is necessary to understand the chemical changes that take place after various ayurvedic processes. Aims and Objectives: 1. Procurement of grahya kasis from local market and its chemical analysis 2. Purification of kasis in dolayantra and its chemical analysis 3. Preparation of kasis bhasma by two methods given by ras tarangini and its chemical analysis. Setting and Design: observational analytical study. Place of study: Department of Rasa Shastra and BK, GS Ayurvedic medical college. Materials and methods: Ashudhha kasis is purified and subjected to incineration by two types, Snuhipatra swaras bhavana, and kanji and Nimbu swaras bhavana as given in rasa tarangini. Chemical composition of the raw form, pure form as well as two types of bhasmas is analyzed in laboratory. Results: 1. Analysis of kasis at each stage of its formation to kasis bhasma shows the changes in physical and chemical properties due to its transformation as it is heated thermal decomposition starts 2. The chemical analysis of kasis bhasma shows highest percentage of ferric iron in comparison with raw and shodhit form. 3. Chemical analysis of kasis bhasma obtained by incineration process, by Snuhipatra swaras bhavana, and kanji and Nimbu swaras bhavana does not show any notable difference in chemical composition. Both methods can be used to prepare kasis bhasma as per availability of bhavana dravya.

scholarly journals Reinforcement of Montmorillonite Clay in Epoxy/Unsaturated Polyester Blended Composite: Effect on Composite Properties

2021 ◽  
Author(s):  
Chakradhar V.P. Komanduri
Keyword(s):  
Chemical Analysis ◽  
Unsaturated Polyester ◽  
Chemical Properties ◽  
Considerable Extent ◽  
Montmorillonite Clay ◽  
Composite Effect ◽  
Mechanical Stirring ◽  
Mmt Clay ◽  
Composite Properties ◽  
And Chemical Properties

Montmorillonite (MMT) clay was disseminated into Unsaturated Polyester (UP) and Epoxy blend systems in diverse weight ratios namely, 0, 1, 2, 3, and 5% to prepare Epoxy/UP/MMT clay composite. The specimen was characterized by thermal and chemical analysis. Homogeneous mixture of blended composites is obtained through mechanical stirring and ultrasonication processes. The testing of thermal and chemical properties was performed. Evidence acquired from the above tests indicate that Epoxy reinforced with UP and further strengthened with MMT clay enhanced the thermal and chemical properties of the composite to a considerable extent. The purpose of this study was to recognize an appropriate composite offering a stronger material with enhanced performance; that is suitable for diverse industrial uses.

Effect of ammonium acryloyldimethyltaurate copolymer on the physical and chemical properties of bleached dental enamel

2019 ◽  
Vol 24 (8) ◽  
pp. 2701-2711
Author(s):  
Thayla Hellen Nunes Gouveia ◽  
Danielle Ferreira Sobral de Souza ◽  
Flávio Henrique Baggio Aguiar ◽  
Gláucia Maria Bovi Ambrosano ◽  
Débora Alves Nunes Leite Lima
Keyword(s):  
Chemical Properties ◽  
Dental Enamel ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

Cairo-East Bank effluent re-use study 3 — Effect of field crop irrigation with secondary treated wastewater on biological and chemical properties of soil and groundwater

Biologia ◽  
2006 ◽  
Vol 61 (19) ◽  
Author(s):  
Ezzat Abd El Lateef ◽  
Jeremy Hall ◽  
Peter Lawrence ◽  
Mohamed Negm
Keyword(s):  
Chemical Analysis ◽  
Pathogenic Bacteria ◽  
Chemical Properties ◽  
Treated Wastewater ◽  
Coliform Bacteria ◽  
Virgin Soil ◽  
Fertile Soil ◽  
Physical And Chemical ◽  
Properties Of Soil ◽  
And Chemical Properties

AbstractLarge scale field trials were conducted in fertile soil and desert (virgin) soil to evaluate the effect of irrigation with secondary treated wastewater from two wastewater treatment plants in Cairo on biological and chemical properties of soil and groundwater. Soil samples were taken for physical and chemical analysis after crop harvest. Groundwater monitoring wells were installed in and around the experimental soil sites. Considerable amounts of macronutrients (NPK) were applied to the grown crops through the treated wastewater irrigation: N (19–79%), P (23–181%) and K (85–357%) of the recommended fertilizer rates according to the crop and the experimental site. Soil physical and chemical analysis showed that both soils are widely variable in water holding capacity, organic matter, pH value, CaCO3, salinity, cation exchange capacity, and soil bulk density in the topsoil (0–30 cm). Groundwater samples which were examined for the presence of pathogenic bacteria (salmonella), faecal coliform bacteria and helminth ova. At the virgin soil site, 10–57% of the samples from each well contained salmonella, whereas at the fertile soil, salmonella was not detected in five wells, and the occurrence in the other four wells was 10–20% of the samples. The numbers of faecal coliforms were similar at both sites, in the range 102–103 MPN per 100 mL. Small numbers of parasite ova were also found in the majority of wells, with a greater number occurring at the virgin soil. The groundwater in both sites was similar and of poor quality, and would be unsuitable for potable or irrigation purposes.

Sign in / Sign up

Export Citation Format

Share Document